It could be a OTH Radar. Check out 'Ghadir' OTH Radar:
<https://www.sigidwiki.com/wiki/Category:HF>
Mike N2MS
> On 03/06/2023 10:44 AM Jeff (W4DD) <w4dd09@gmail.com> wrote:
>
>
> My observation from North GA
>
> Centered about 28.600 and 100KHz wide. At one point it was 500KHz wide. It
> consisted of hundreds of individual carriers. Three seconds on at spacing
> of 850 Hz, one second of silence, then 5 seconds of carriers at 300Hz
> spacing, then one second of silence, This repeated endlessly from about 8AM
> to 2PM when EU faded out. I have a pan adapter capture if anyone is
> interested (reflector did not allow sending it)
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